What is "penthorum sedoides"

Stonecrop \Stone"crop`\, n. [AS. st[=a]ncropp.]

1. A sort of tree. [Obs.]
   --Mortimer.

2. (Bot.) Any low succulent plant of the genus Sedum, esp. Sedum acre, which is common on bare rocks in Europe, and is spreading in parts of America. See Orpine.

   Virginian stonecrop, or Ditch stonecrop, an American plant ( Penthorum sedoides).

Penthorum sedoides (known by the common name ditch stonecrop), is a perennial forb native to the eastern United States which produces small white flowers in summer.